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I've searched around to find if anyone has had the same problem as I do with my car, and have not found any.

My Car: 1994 Civic Hatchback DX, swapped with a d16z6 and manual trans, along with all wiring harnesses.

I finished the swap back in late August, and it has ran perfect, loads of power compared to the stock d15 and auto trans. But when it came to early October, I was having problems with the idle and power, this started while I was driving on the highway.

So let me describe the idle/power problem. When I drive the car its runs perfect, but then suddenly the car almost cuts out, sputters a bit, then holds the idle at 1000k, even when the car is all warmed up. Whenever it idles like this, it runs pretty powerless, and it super sluggish when I start driving in first gear. Also, sometimes when it runs like this, I can hear some little pops coming from the back of the exhaust, something that doesn't happen when it runs good.

I felt like the car was clogged up somewhere in the intake, so I sea foamed the intake and cleaned the IACV, and the problem still remains. Also looked to check the o2 sensor, but it seems to do nothing whether it's plugged in or not. I'm kinda lost on this issue, just wondering if anyone has experienced this or why I should check to fix this issue. Thanks!

 
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Have you verified timing?

 
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Have you found the out what was causing this... I have been experiencing these symptoms lately.. also my d16z6 idles really low at stop sighs or stoplights when at running temp it then begins to like wanna die

 
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I would take a look at the engine temp sensor and wiring that feeds the ecu. This is Not the temp gauge sender. Also, the throttle position sensor can cause similar issues.

 
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Unfortunately nothing yet, seems like the car wants to run like this more often, especially when im warming up the car from cold. I believe its something to do with the fuel system because the car is spitting black soot out of the exhaust when it runs like this.



Thanks I'll check both of those when I go on winter break.

 
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That is running ridiculously rich

 
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Figured out it was the MAP sensor lol